Plaster base



F. GARDIN Nov. 10, 1942.

PLASTER BASE Filed Ma rch 5. 1941 la 0 ll:

E R u m F INVKN'TOR jo-w ATTORNEY Patented Nov. 10, 1942 UNITED STATES l-" ATENT QEFICE 1 Claim.

In the interior finishing of houses it is common practice to apply the plaster for the walls on wood lath or on perforated sheets of some suitable material. In either case the material used is water-absorbent, naturally absorbing some of the water in the freshly applied plaster. The result of this condition is that a thoroughly dry wall requires the drying of two intimately associated materials of entirely different characteristics that require different periods of time for drying. Furthermore, the drying conditions for different portions of a wall vary widely; for instance, those portions exposed more or less directly to a current of air will dry quickly, while those portions not exposed to such a. current sometimes dry very, Very slowly.

The object of the present invention is, therefore, to provide a plaster base that is so constructed as to effectually prevent its absorption of water and so secure a substantially uniform drying of the plaster throughout, thereby preventing the cracking of the plaster resulting from the method above outlined.

It is also an object of the invention to provide a plaster base of the character indicated that will be simple in form and construction, economical to manufacture, easily and quickly applied, and highly efiicient in its practical application.

In the drawing:

Figure 1 is a face elevation of a portion of a plaster base constructed in accordance with my invention but with the perforations still covered, a part being broken away.

Figure 2 is a sectional view on line 2-2 of Figure 1.

Figure 3 is an isometric perspective View of a portion of a completed plaster base constructed in accordance with my invention.

[Figure 4 is a detail section on line 4-4 of Figure 3.

Figure 5 is a detail section on line 55 of Figure 3.

Referring now more particularly to the drawing, I show at I a sheet of any suitable material having the necessary characteristics to form the body of the sheet.

Sheet I has a number of rectangular holes or perforations as 2 formed therein. These perforations 2 may be spaced and arranged as circumstances dictate, the dimensions of their sides preferably corresponding to the thickness of the sheet I, or substantially corresponding thereto.

Each side of sheet I is overlaid with a sheet of paper as indicated at 3 and 4. These sheets 3 and 4 may be secured to the body sheet I in any suitable manner, as by cementing or by the punchings now to be described.

Over each perforation 2 the sheet 3, hereinafter called the top sheet, is cut as shown at 5, 6 and I to form two identical flaps as 8, which flaps are then turned downwardly as indicated at 9 to cover opposite sides of the hole in which they are placed.

The bottom sheet 4 is cut in like manner as indicated at I3, II and I2, to form two identical flaps I3, but these cuts are made at right angles to the corresponding cuts in the top sheet, so that when the two flaps I3 are turned in to cover opposite sides of the hole they cover the sides at right angles to the first mentioned sides, and, of course, fold in from the opposite direction.

When the flaps '8 and I3 are turned in as above described they are self-retaining, because the edges of the flaps turned in last engage the exposed sides of the flaps turned in first near their edges, their natural resiliency urging them into intimate contact and effectually preventing material subsequent movement.

By means of this construction the entire surface of the body sheet I is enveloped in the two surface sheets 3 and 4 in such a manner that no material amount of water can reach it when the plaster is applied, and the plaster is permitted to dry so uniformly that cracks will not appear in it.

Although but one specific embodiment of the invention has been herein illustrated and described, it will be understood that various alterations in the details of construction and mode of assembly and application may be made without departing from the scope of the invention as indicated in the appended claims.

I claim:

A plaster base comprising, a supporting body sheet of material having rectangular and spaced holes formed therethrough, and a thin sheet of flexible material disposed on each side thereof, said thin sheets being cut over said holes to form flaps, the flaps of one sheet being bent inwardly of the body sheet to cover two opposing sides of the holes, and the flaps on the other sheet being cut and bent inwardly of the body sheet to cover the other two opposing sides of the holes, the last mentioned flaps being constructed and arranged to engage the exposed sides of the first mentioned flaps whereby the resiliency of the material is utilized to hold the flaps in their bent positions.

FRANK GARDIN. 

